Side effects of iPill include nausea, mood swings, and delayed periods. Learn what happens after taking this emergency contraceptive. Know more about what is I-Pill ? what are the side effects and its uses. I-Pill is an emergency contraceptive tablet. read more now What Are the Side Effects of I Pill ? Short-term side effects include: Unexpected spotting or vaginal bleeding. It adversely affects the libido. Nausea. Breast tenderness. Headache. Lower abdomen pain. Levonorgestrel induces allergies, and it is the active component of the pill. Weight gain. Dizziness. Altered periods (late, early, or absent).